1 ;;;; backend-library.scm -- helpers for the backends.
3 ;;;; source file of the GNU LilyPond music typesetter
5 ;;;; (c) 2005--2009 Jan Nieuwenhuizen <janneke@gnu.org>
6 ;;;; Han-Wen Nienhuys <hanwen@xs4all.nl>
8 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
11 (define-public (ly:system command . rest)
13 (dev-null "/dev/null")
14 (silenced (if (or (ly:get-option 'verbose)
15 (not (access? dev-null W_OK)))
17 (format #f "~a > ~a 2>&1 " command dev-null))))
18 (if (ly:get-option 'verbose)
20 (ly:message (_ "Invoking `~a'...") command))
25 (system-with-env silenced (car rest))
30 (ly:message (_ "`~a' failed (~a)") command status)
32 ;; hmmm. what's the best failure option?
33 (throw 'ly-file-failed)))))
35 (define-public (system-with-env cmd env)
37 "Execute CMD in fork, with ENV (a list of strings) as the environment"
39 ;; laziness: should use execle?
41 ((pid (primitive-fork)))
49 (cdr (waitpid pid)))))
51 (define-public (sanitize-command-option str)
52 "Kill dubious shell quoting"
56 (regexp-substitute/global #f "[^-_ 0-9,.a-zA-Z'\"\\]" str 'pre 'post)
59 (define-public (search-executable names)
60 (define (helper path lst)
63 (if (search-path path (car lst)) (car lst)
64 (helper path (cdr lst)))))
66 (let ((path (parse-path (getenv "PATH"))))
69 (define-public (search-gs)
71 ;; must be sure that we don't catch stuff from old GUBs.
72 (search-executable '("gs")))
74 (define-public (postscript->pdf paper-width paper-height name)
75 (let* ((pdf-name (string-append
76 (dir-basename name ".ps" ".eps")
78 (is-eps (string-match "\\.eps$" name))
79 (paper-size-string (if is-eps
81 (ly:format "-dDEVICEWIDTHPOINTS=~$\
82 -dDEVICEHEIGHTPOINTS=~$"
83 paper-width paper-height)))
85 (cmd (simple-format #f
90 -dCompatibilityLevel=1.4\
101 (if (ly:get-option 'verbose) "" "-q")
102 (if (or (ly:get-option 'gs-load-fonts)
103 (ly:get-option 'gs-load-lily-fonts))
109 ;; The wrapper on windows cannot handle `=' signs,
110 ;; gs has a workaround with #.
111 (if (eq? PLATFORM 'windows)
113 (set! cmd (string-regexp-substitute "=" "#" cmd))
114 (set! cmd (string-regexp-substitute "-dSAFER " "" cmd))
115 (if (access? pdf-name W_OK)
116 (delete-file pdf-name))))
118 (ly:message (_ "Converting to `~a'...") pdf-name)
122 (use-modules (scm ps-to-png))
124 (define-public (postscript->png resolution paper-width paper-height name)
125 (let* ((verbose (ly:get-option 'verbose))
128 ;; Do not try to guess the name of the png file,
129 ;; GS produces PNG files like BASE-page%d.png.
130 (ly:message (_ "Converting to ~a...") "PNG")
132 #:resolution resolution
133 #:page-width paper-width
134 #:page-height paper-height
135 #:rename-page-1 rename-page-1
137 #:anti-alias-factor (ly:get-option 'anti-alias-factor)
138 #:pixmap-format (ly:get-option 'pixmap-format))
141 (define-public (postprocess-output paper-book module filename formats)
142 (let* ((completed (completize-formats formats))
143 (base (dir-basename filename ".ps" ".eps"))
144 (intermediate (remove (lambda (x) (member x formats)) completed)))
145 (for-each (lambda (f)
146 ((eval (string->symbol (format "convert-to-~a" f))
147 module) paper-book filename)) completed)
148 (if (ly:get-option 'delete-intermediate-files)
149 (for-each (lambda (f)
150 (if (file-exists? f) (delete-file f)))
151 (map (lambda (x) (string-append base "." x)) intermediate)))))
153 (define-public (completize-formats formats)
154 (define new-fmts '())
155 (if (member "png" formats)
156 (set! formats (cons "ps" formats)))
157 (if (member "pdf" formats)
158 (set! formats (cons "ps" formats)))
159 (for-each (lambda (x)
160 (if (member x formats) (set! new-fmts (cons x new-fmts))))
162 (uniq-list (reverse new-fmts)))
164 (define (header-to-file file-name key value)
165 (set! key (symbol->string key))
166 (if (not (equal? "-" file-name))
167 (set! file-name (string-append file-name "." key)))
168 (ly:message (_ "Writing header field `~a' to `~a'...")
170 (if (equal? "-" file-name) "<stdout>" file-name))
171 (if (equal? file-name "-")
173 (let ((port (open-file file-name "w")))
180 (define-public (output-scopes scopes fields basename)
181 (define (output-scope scope)
186 (let ((val (if (variable-bound? var) (variable-ref var) "")))
187 (if (and (memq sym fields) (string? val))
188 (header-to-file basename sym val))
191 (apply string-append (map output-scope scopes)))